you go to the elite four which is to the left of the place you got your 8th badge. you need to cut the tree then go through a cave to get there. it'd be a good idea to have Pokemon with levels over 60!
you must catch 60 Pokemon
No You don't.
Just a certificate saying that you completed the pokedex.
Trade one from Pokemon XD: Gale of darkness (after purification and completing story mode).
No way you can't get a johto starter Pokemon in Pokemon leafgreen. The only way is to trade with someone to get it.
get the ruby and the Sapphire gems from 4and 6 islands . the go to ceroolien cave.you can find mew2 in there.
first you bet the elite 4 and then go to ciolol and then you need to find the gems
migrate all your Pokemon except for an egg or a level 1 Pokemon and then start new game with another starter.
hopefully check out the johto Pokemon on the sevii islands after getting national dex from professor oak.
you find every single Pokemon and then you go to her and then you ask twice and she will gve you three moon stones, five fire, and two sun.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
With the dotted holes in leaf green, that is where you get one of the gems to get inside the Rocket Warehouse. Just have a Pokemon that knows cut, go up to it, then press START, POKEMON, ???, CUT. It's that easy!